基于晶体塑性模型的板料成形极限预测

The Forming Limit Prediction Using a Rate-Dependent Crystal Plasticity Model

用晶体塑性模型及M-K理论对具有初始织构的金属板坯的成形极限(FLD)进行分析,研究了初始缺陷、材料参数及初始织构对成形极限应变的影响.结果表明,晶体塑性理论能较好地预测金属板坯的成形极限曲线,同时通过初始织构及其演化的模拟能成功地分析材料各向异性对FLD的影响.

A rate-dependent crystal plasticity model was applied combined with M-K approach to predict forming limits （FLD） for FCC sheet metals having initial texture. The effects of initial imperfection, material parameters and initial texture on forming limit strain were studied. The computed FLD was compared with experimented data. The results indicate that the crystal plasticity model can predict FLD of sheet metal well, and can analyze the effect of material anisotropy on FLD by simulating the initial texture and its evolution.